Small QuarterTurn Button, Springs, and Back Plate Bryke Racing Small QuarterTurn Button: Self Ejecting/Spring Loaded (Head: OD 5/8"(.625), Stem: OD 5/16" (.3125), Hole Center to Center: 1-1/8", Length: .500") (5-Pack) Small QuarterTurn Springs: Measures 1" from Center to Center, .375" Height (5-Pack) QuarterTurn Spring Back Plates: Used for small self ejecting buttons 5/16" (Measures 1" from Center to Center (1" springs) 1-1/2" Wide x 1-1/2" long (Overall length) (5-Pack)